id:A100802 - OEIS Search Results

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a(n) = least k >= 0 such that (n+k)/2 is prime.

+0
2

4, 3, 2, 1, 0, 1, 0, 3, 2, 1, 0, 3, 2, 1, 0, 7, 6, 5, 4, 3, 2, 1, 0, 3, 2, 1, 0, 7, 6, 5, 4, 3, 2, 1, 0, 3, 2, 1, 0, 7, 6, 5, 4, 3, 2, 1, 0, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 3, 2, 1, 0, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 7, 6, 5, 4, 3, 2, 1, 0, 3, 2, 1, 0, 7, 6, 5, 4, 3, 2, 1, 0, 11, 10, 9, 8, 7, 6, 5 (list; graph; listen)

	OFFSET	`0,1`
	COMMENT	`If a(n) = k is nonzero then a(n+1) = k-1. a(2p) = 0 for p prime.`
	MATHEMATICA	`a = {}; Do[k = 0; While[ ! PrimeQ[(n + k)/2], k++ ]; AppendTo[a, k]; , {n, 0, 120}]; a (Chandler)`
	CROSSREFS	`Cf. A100803.` `Sequence in context: A143543 A067017 A067018 this_sequence A022960 A023446 A066440` `Adjacent sequences: A100799 A100800 A100801 this_sequence A100803 A100804 A100805`
	KEYWORD	`nonn,easy`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Dec 18 2004`
	EXTENSIONS	`Extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Jan 19 2005`

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Last modified December 7 23:50 EST 2009. Contains 170430 sequences.

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